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cmake: Add ld-version-script option 

Add option to enable or disable the use of linker version scripts.
Check support for version scripts, and enable if not explicitly
disabled.
This commit is contained in:
Roger Leigh 2017-01-03 18:47:06 +00:00
parent 4a090adef8
commit de80cb3150
1 changed files with 22 additions and 1 deletions
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23
CMakeLists.txt
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@ -66,6 +66,27 @@ if(MSVC)
include_directories(${CMAKE_CURRENT_SOURCE_DIR})
endif()
option(ld-version-script "Enable linker version script" ON)
# Check if LD supports linker scripts.
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map" "VERS_1 {
global: sym;
};
VERS_2 {
global: sym;
} VERS_1;
")
set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Wl,--version-script=\"${CMAKE_CURRENT_BINARY_DIR}/conftest.map\"")
check_c_source_compiles("int main(void){return 0;}" HAVE_LD_VERSION_SCRIPT)
set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE})
file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
if (ld-version-script AND HAVE_LD_VERSION_SCRIPT)
set(HAVE_LD_VERSION_SCRIPT TRUE)
else()
set(HAVE_LD_VERSION_SCRIPT FALSE)
endif()
if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
# If we're doing an out of source build and the user has a zconf.h
# in their source tree...
@ -202,7 +223,7 @@ endif()
if(UNIX)
# On unix-like platforms the library is almost always called libz
set_target_properties(zlib zlibstatic PROPERTIES OUTPUT_NAME z)
if(NOT APPLE)
if(HAVE_LD_VERSION_SCRIPT)
set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
endif()
elseif(BUILD_SHARED_LIBS AND WIN32)